^^^^ everyone in the rustblood car is very very very dead now obviously (except marsti, who's either heavily injured or dead as well) since the explosion had the most impact there/was basically targetting that car, the other deaths are probably because of the crash itself, which could be most of the trolls in lower-mid cars.
a comment earlier in this topic theorized that all the trolls who appeared in the ending scene (marsti, cirava, lanque, tyzias, elwurd, mallek, ardata, marvus & chaehut) are going to live, and i really REALLY hope it isnt just limited to those specific trolls because it stelsa dies i will LOSE MY MIND but that theory is sooo cool
but other than me regurgitating information i really really believe act 3 IS coming out since its in active development!! and i dont mind waiting a bit since my interests stick to me for a very very long time